According to PriceCharting, Phantasy Star and Alex Kidd in Shinobi World are among the rarest Sega Master System games.

"Eli's Ladder" is the rarest educational video game in existence ... Nintendo's exclusive rights to "Tetris" on video game consoles, the Sega Genesis (or Megadrive) never saw a "Tetris" game ...

Wonder Library is a very rare Sega Mega Drive cartridge which shipped ... not any emulator can use a cart-boot feature to run this game (some do support Flux, which works similarly, so it is ...

Some forgotten consoles like the Intellivision III and Neo Geo Pocket Color are rare and sought after by collectors today.